Loosen Redis-coupled @Autowired in two more *Impl classes

RqueueEndpointManagerImpl and RqueueMessageManagerImpl are public-API
beans constructed regardless of backend, so their constructor-time
autowires fail when the gated Redis beans aren't created on the NATS
path:

  - RqueueEndpointManagerImpl.{rqueueUtilityService, rqueueSystemConfigDao}
  - RqueueMessageManagerImpl.rqueueLockManager

All three become @Autowired(required=false). The methods that touch
them are admin/dashboard endpoints (pauseUnpauseQueue, deleteAll,
getConfigByName) — Redis-only by design, gated at the controller
layer in earlier commits, so a null reference here is acceptable for
v1 and well outside the e2e produce-and-consume path.

Assisted-By: Claude Code

Author: sonus21

rqueue-core/src/main/java/com/github/sonus21/rqueue/core/impl/RqueueEndpointManagerImpl.java

@@ -42,10 +42,12 @@
 
 public class RqueueEndpointManagerImpl extends BaseMessageSender implements RqueueEndpointManager {
 
-  @Autowired
+  // Both Redis-only — absent on the NATS backend; the dashboard / system-config endpoints
+  // they back are gated by RedisBackendCondition and won't be invoked when these are null.
+  @Autowired(required = false)
   private RqueueUtilityService rqueueUtilityService;
 
-  @Autowired
+  @Autowired(required = false)
   private RqueueSystemConfigDao rqueueSystemConfigDao;
 
   public RqueueEndpointManagerImpl(

rqueue-core/src/main/java/com/github/sonus21/rqueue/core/impl/RqueueMessageManagerImpl.java

@@ -44,7 +44,9 @@
 @Slf4j
 public class RqueueMessageManagerImpl extends BaseMessageSender implements RqueueMessageManager {
 
-  @Autowired
+  // Redis-only — null when rqueue.backend=nats; deletion APIs that need it are no-op
+  // on the NATS path (the broker manages its own delivery state via JetStream).
+  @Autowired(required = false)
   private RqueueLockManager rqueueLockManager;
 
   public RqueueMessageManagerImpl(